We've been doing something different with the mailbag, including Twitter questions with the regular mailbag submissions. To submit a mailbag entry via Twitter, simply include the hashtag #big12mailbag. You also still can send in questions the traditional way here, too.

Trotter: At this point, I think it's only a matter of time before Grant Rohach is named the starter. He was clearly the best QB in the spring game, and coming off the way he played at the end of last season, momentum is in his corner. I know the Cyclones are high on the potential of redshirt freshman Joel Lanning, and Rohach will have to perform once the season begins to keep the job, but at this point, it's difficult envisioning anyone other than Rohach starting the opener against North Dakota State.

Trotter: My two darkhorse picks at this point would be Texas Tech and TCU. Schedule is a big part of this, and Tech gets Oklahoma and Texas at home, and Baylor in Arlington, Texas. If the Red Raiders could escape a September Thursday night clash at Oklahoma State, then they could be a factor. QB Davis Webb has made tremendous improvement since December, and he's going to have plenty of firepower surrounding him. Assuming Fields is back to his old self, the Horned Frogs will again be a formidable defense. The big question, as always, is, can they score enough points? But if Matt Joeckel can step in at QB and direct what is essentially the same offense he had at Texas A&M to respectability, TCU could be a handful.

Trotter: Charlie Strong can't get destroyed by Oklahoma. Can't enter any fourth quarter without a legitimate chance to win. Can't lose more than three games. If he avoids those three potholes, he has chance to take Texas a step forward. To me, that's the litmus test.

Trotter: Anytime a team loses its leading tackler, it hurts. Fortunately for the Sooners, they're deep at linebacker, and can absorb a key loss there better than they'd be able to at some other positions. Jordan Evans played well as a true freshman, and shined in place of Shannon in the spring game. A linebacking corps of Big 12 Defensive Freshman of the Year Dominique Alexander, sack-master Eric Striker and Evans would still be stout. Of course, it would be even better with Shannon.

Trotter: That's a tough question. It was startling how much the K-State defense suffered when Ty Zimmerman wasn't on the field last year, but I have faith Dante Barnett is ready to assume a leadership role in that secondary and stabilize the defense. I have less faith right now in K-State's running backs. So far this spring, no one has really emerged from a crop of backs with almost no meaningful experience. The K-State attack has always been predicated on a strong running game, so this is no small issue. Maybe freshman Dalvin Warmack can jumpstart the position when he arrives this summer. But running back looks like the biggest question on a solid-looking team with not many questions elsewhere.